Naming FOlder like CON

create a folder "CON" or "AUX" or "NUL".

Rename folder from the right click option........

Now press alt + 255...

press 255 frm the right side of the key bords i.e, Num pad.

where only numbers are given.....

now write con and then press enter

you ll see a con folder in ur pc

and also you can delete it easily.